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Note 13 - Operating Leases (Detail) - Minimum annual rentals for all operating leases having initial non-cancelable lease terms in excess (USD $) In Thousands, unless otherwise specified | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | ---
2013 |  |  |  |  | $ 941
2014 |  |  |  | 688 |
2015 |  |  | 635 |  |
2016 |  | 580 |  |  |
2017 | 548 |  |  |  |
Thereafter | 2,614 |  |  |  |
Total future minimum rental payments | $ 6,006 |  |  |  |

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